coturn: Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-68555 is fixed in coturn on 1 platform by DEBIAN-CVE-2026-68555 (version 4.18.0-1), released August 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Coturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobile_begin_transition() in src/server/ns_turn_server.c disarms each new session's allocation timeout and overwrites the allocation's single mobile_pending_resume link, leaving earlier pending sessions unreachable by the cleanup path, while copy_auth_parameters() ignores inc_quota() failure. The attacker can therefore retain unbounded server-side sessions and exhaust process memory even when --user-quota=1 is configured. This issue is fixed in version 4.16.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| coturn · Debian 14 | 4.18.0-1 | DEBIAN-CVE-2026-68555 | Aug 19, 2026 |
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